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D. L. 'MQGORKINDALR' PLUG.

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UNITED STATES PATENT CEEICE.

DUNCAN L. MOCORKINDALE, OF CHILDS, MARYLAND.

PLUG.`

SPECIFICATION forming part of Letters Patent No. 572,365, dated December1, 1896.

Application filed January 2, 1896. Serial No. 574,106. (No model.) I

To all whom t may concern.-

Be't known that I, DUNCAN L. MoCoRKIN- DALE, a citizen of the UnitedStates, residing at Childs, in the county of Cecil and State ofMaryland, have invented certain new and useful Improvements in Plugs, ofwhich the following is a specification. v

My invention relates to a new and useful article of manufacture, and hasfor its obj ect to produce a certain class of articles from materialwhich has heretofore gone to waste as being of no service; and itconsists of molding into shape thewaste products of papermills, such asthe overflow or froth from the liquid compound from which-paper is made,broken and dirty wood-pulp, dirty clay, and refuse fiber, such as dustfrom pickers and dusters, which on account of its`"p`articularingredients and proportions thereof has not been heretofore put toanypr'a'ctical use.

In the manufacture of paper from pulp a solution is used which iscomposed of fiber, clay, and sizing, the latter usually being rosin,soda-ash, and alum, and in the manipulation of this liquida certainamount of the ingredients thereof is separated from the liquid onaccount of being too ne to felt nd float upon the top thereof and ispermitte to run off by overiiowing. This overiiow is called froth, andis of such quality as to be of no service in paper-making, and thereforeis permitted to run to waste.' I have found by experiment that thisfroth, combined with the other waste products above named and whenproperly treated and molded under pressure, produces a most excellentquality of plug, such as used in the central openings of paperrolls.

The method of using these plugs is shown in Figure l of the drawings,the plugs being designated A and the roll of paper B. Fig. 2 representsone of these plugs in perspective. Heretofore these plugs have been madeof Wood, Which required turning and boring, and when so made answeredthe purpose but poorly on account of their liability to split,`

chip, and warp; but by the use of plugs made in accordance with myimprovement these disadvantages are entirely obviated, as the Wasteproduct, When molded under pressure, is firm and tenacious and has notendency to warp, split, or chip, and yet is sufficiently elastic totake hold firmly upon the walls of an opening in which the plugs may beforced. On account of this elasticity and the other qualities .mentionedthis material produces a most excellent bung for barrels and the like,as shown in Fig. 2, in which D is the barrel, and E is the bung.

By the use of my improvement paper-mills are enabled to dispose of theirWaste stock in the production of the plugs before mentioned, thereforeobviating the necessity of having to buy the above-described Woodenplugs at a considerable cost, though of inferior quality for the purposeintended.

Having thus fullydescribed my invention, what I claim as new and usefulis- As a new article of manufacture, a plug composed of froth and dirtywood-pulp, clay and refuse fiber, resulting from the manufacture ofpaper-making, and which is molded into shape, substantially as shown.

In testimony whereof I have hereunto affixed my signature in thepresence of two subscribing witnesses.

DUNCAN L. MCCORKINDALE.

Titnessesz S. S. WILLIAMSON,

B. B. DUNBAE.

